package com.mokairui.http;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.*;
import io.netty.util.CharsetUtil;

import java.net.URI;

/**
 * @Description com.sunshine.http
 * @Author Mokairui
 * @Since 2022/1/11
 */
public class SimpleHttpHandler extends SimpleChannelInboundHandler<HttpObject> {

    // 读取客户端数据
    @Override
    protected void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {
        // 判断 msg 是不是 HttpRequest 请求
        if (msg instanceof HttpRequest) {

            System.out.println("msg 类型 = " + msg.getClass());
            System.out.println("客户端地址 " + ctx.channel().remoteAddress());

            HttpRequest httpRequest = (HttpRequest) msg;
            URI uri = new URI(httpRequest.uri());
            if ("/favicon.ico".equals(uri.getPath())) {
                System.out.println("请求了 favicon.ico, 不做响应");
                return;
            }

            // 回复信息给浏览器 [http协议]
            ByteBuf content = Unpooled.copiedBuffer("hello, 我是服务器", CharsetUtil.UTF_8);

            // 构造一个 http 的响应, 即 httpResponse
            DefaultFullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK, content);

            response.headers().set(HttpHeaderNames.CONTENT_TYPE, "text/plain");
            response.headers().set(HttpHeaderNames.CONTENT_LENGTH, content.readableBytes());

            ctx.writeAndFlush(response);

        }
    }

}
